TRIANGULATION LASER SENSORS, LDS603 Series Rev. G (26.06 ...

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TRIANGULATION LASER SENSORS, LDS603 Series - Time Sampling or - Trigger Sampling With sampling by time selected, the sensor automatically transmits the measurement result via serial interface in accordance with selected time interval (sampling period). With sampling by external input is selected, the sensor transmits the measurement result when external synchronization input is switched and taking the division factor set into account. Range of the analog output (beginning and end of the range of analog output). While working with the analog output, resolution can be increased by using the ‘Window in the operating range’ function which makes it possible to select a window of required size and position in the operating range of the sensor within which the whole range of analog output signal will be scaled. If the beginning of the range of the analog signal is set at a higher value than the end value of the range, this will change the direction of rise of the analog signal. Analog output operation mode . When using ‘window in the operating range’ function, this mode defines the analog output operation mode. Analog output can be - in the window mode or - in the full mode. ‘Window mode’. The entire range of the analog output is scaled within the selected window. Outside the window, the analog output is "0". "Full mode". The entire range of the analog output is scaled within the selected window (operating range). Outside the selected window, the whole range of the analog output is automatically scaled onto the whole operating range of the sensor (sensitivity range). Logical output mode and mutual synchronization mode. Logical output can be used for - indication of run-out beyond the range ("0" – object is beyond the range (beyond the selected window in the range), "1" – object is within the range (within the selected window in the range) - mutual synchronization of two or more sensors. Selection of the mutual synchronization mode makes it possible to synchronize measurement times of two and more sensors. This mode is convenient to use for control of one object with several sensors, for example, when thickness is to be measured. On hardware level, sensor synchronization is carried out by combining AL lines. Time of lock of the result. If the sensor does not find out object or if the authentic result cannot be received, zero value is transferred. The given parameter sets time during which is transferred the last authentic result instead of zero value Number of averaged values specifies the number of source results to be averaged for deriving the output value. Source data are stored in a circular buffer, and new mean value is calculated each time the new result arrives; therefore, the output may regarded as a moving average. The refreshment of the result through the analog output is also controlled by the two parameters described above. Time limit for integration. Intensity of the reflected radiation depends on the surface quality of objects under control. Therefore, the time of integration of radiation incident onto the CMOS-array is automatically adjusted to achieve maximum measurement accuracy. This parameter specifies maximum allowable time of integration. If the radiation intensity received by the sensor is so small that no reasonable result is obtained within the time of integration equal to the limiting value, the sensor transmits a zero value. Increasing of this parameter expands the possibility of control of lowreflecting (diffuse component) surfaces; at the same time this leads to reduction of data refreshment rate and increases the effects of exterior light (background) on the measurement accuracy. Factory setting of the limiting time of integration is 1300 us. Page 4/22 Rev. G (26.06.2008) Finger GmbH & Co. KG • Schamerloh 84 • 31606 Warmsen • Internet: www.finger-kg.de • email: info@finger-kg.de
TRIANGULATION LASER SENSORS, LDS603 Series Level of laser output power. By changing this parameter it is possible to switch the sensor to operation with minimum limiting time of integration (maximum operation speed) for particular surfaces. The point of z ero - sets a zero point of absolute system of coordinates in any point within the limits of a working range. The reserved parameters are used for the sens ors setting. Change of these parameters can lead to infringement of sensor calibration. Correct change of parameters is made with the help of the installation program supplied with the sensor. Page 5/22 8. DESCRIPTION OF SERIAL INTERFACE (RS232 or RS485) 8.1. The hardware port RS232 allows sensor to be connected directly to a computer. 8.2. In accordance with the protocol accepted and hardware capability, the RS485 port makes it possible to connect up to 127 sensors to one data collection unit by a common bus circuit. 8.3. Network data communications protocol assumes the presence of ‘master’ in the net, which can be a computer or other information-gathering device, and from 1 to 127 ‘slaves’ (RF603 Series sensors) which support the protocol. Each ‘slave’ is assigned a unique network identification code – a device address. The address is used to form requests or inquiries all over the net. Each slave receive inquiries containing its unique address as well as ‘0’ address which is broadcast-oriented and can be used for formation of generic commands, for example, for simultaneous latching of values of all sensors and for working with only one sensor (with both RS232 port and RS485 port). 8.4. Serial data transmission format: Rev. G (26.06.2008) 1-start bit,8-data bits,1-odd bit,1-stop bit. Odd bit is complementary to 8-data bits for oddness. 8.5. The communications protocol is formed by communication sessions, which are only initiated by the ‘master’. There are two kinds of sessions: 1) ‘inquiry’,[‘message’] — [‘answer’], square brackets include optional elements 2) ‘inquiry’ — 'data stream’ — [‘inquiry’]. ‘Inquiry’ (INC) is a two-byte message, which fully controls communication session. The ‘inquiry’ message is the only one of all messages in a session where most significant bit is set at 0; therefore, it serves to synchronize the beginning of the session. In addition, it contains the device address (ADR), code of inquiry (COD) and, optional, the message (MSG). The ‘inquiry’ format: INC0(7:0),INC1(7:0) = 0,ADR(6:0),1,0,0,0,COD(3:0), [MSG]. ‘Message’ and ‘answer’ are data bursts that can be transmitted by ‘master’ or by ‘slave’ in the course of the session, respectively. ‘Data stream’ is an infinite sequence of data bursts or batches transmitted from ‘slave’ to ‘master’, which can be interrupted by a new inquiry. In transmission of ‘data stream’ one of the ‘slaves’ fully holds data transfer channel, therefore, when ‘master’ produces any new inquiry sent to any address, data streaming process is stopped. Also, there is a special inquiry to stop data streaming. 8.6. Message transfer. All messages with a message burst contain 1 in the most significant digit. Data in a message are transferred in tetrads. When byte is transmitted, lower tetrad goes first, and then follows higher tetrad. When multi-byte values are transferred, the transmission begins with lower byte. The following is the format of two ‘message’ data bursts for transmission of byte DAT(7:0): Dt0(7:0);Dt1(7:0) = 1,0,0,0,DAT(3:0);1,0,0,0,DAT(7:4). 8.7. Answer transfer (for the 01h…04h enquiry codes). Finger GmbH & Co. KG • Schamerloh 84 • 31606 Warmsen • Internet: www.finger-kg.de • email: info@finger-kg.de
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